Method of curing concrete



" Patented No i, 1924. r

U NHED 'I sr- 'rss,

PATENT .o-*Fca mmm: Asmara', or s'r. LOUIS, mesonin.

METEOD OF CURING CONCRETE.

Application filed November 25, 1922. Serial No. 008335.

l use the same, reference being had `to the ac.-

companying specification. y

My invntion relates to a method of curdrawings, formng part of this ingconcrete articles, particularly hollow cylindrical articles, such aspipes, parts and the like. As it has been found that the aplication 'ofdry heated air to such articles or curing or hardening them causes greatdeterioration in their quality, it has been 90 customary to either curethe-m withoutthe application of artificial heat, or to place.

, .them in a steam room and cure by'the'aplication' of heated air andsteam. Both.

t ese processes are slow, the former requiring about twenty eight daysand the latter at least forty eight ours to eflectively cure .and hardenthe article.

'The object of my invention is to reduce the time necessary to cure thearticle by enclosin it'in an air-tight receptacle, prefer- 'abl t emold:in which it is formed, 'toge er with a small quantity of water, thereceptacle being then heated to cause the curing of the article entirelyby the vapor generated in the interier. f

' :In theaccompanying drawin which illustrate one form of apparatus orcarrying out my method, Fig. 1. s' a. longitudinal section andFig. 2 isa section taken on the line 2-2 of Fig. '1. 4

The article to be cured, which, as shown in the drawing, is a section"of pipo 5,15 formed in a mold comprising a -cylndrcal body of sheetmetal 6 and a pair of heads 7 and 8, respectively; The body 6 is splitalong one side and provided with flanges 9 held together by bolts 10 toallow of the rel lease of the finished article. The heads 7 and 8 areheld against the ende of the body' 6 by a rod 11 threaded at each end toreceive nuts 12. One of the heads, as for example 8, has formed in it anopening 13 through' which the concrete `miXture is placed in the mold.The mold is rotated by any suitable means until the concrete isdeposited in a uniform layer against the .walls of the body 6. All thewater contained in the mold is now drained ofi through the opening 13'asI'have found that` the chemicals oontained in the water remaining in themold after the depositionof the concrete on the Walls has an injuriouseflect on the article. -AJ small and the openin 13 'closed by means of astopper 15 whic should efectively prevent the entrance of air. The splitalong the side of the body as well as' the ointsbetween its head andbody will be efl'ective ly sealed by the material of the pipe 5.'

Heat is now appled to the exterior of the mold to v'aporiz'e the water14 130 cure the pipe 5. Both the degreeof heat and length of timerequired will vary somewhat wth the size .of the article. I have foundthat with a pipo six 'inches in diameter and having wal s five eighthsofan inch in thickness, a temperature of one hundred and 'fifty degreesFahrenheit a plied for Seven hours will be suflicient to t oroughly curethe article. It will be seen, therefore, that by my rocess, the lengthof time required for curng and hardenn manufactures of cement is greatlyreduce Moreover, I find that my rocess causes 'no deterioration of theartic e cured; My. %rocess also reduces the cost of manufactureylessening the number of molds necessary for a given output.

` Havin fully described my invention,.

what I c aim as new. and `desire to secure .by

'Letters Patent of the United States is:

stantially air tight containe'. together with a portion of water andheating-the contaner to cure the article solely by the vapor gener-:ated in the interier of the container.

2. The process of curingarticles of cement quantity of clear water 14 isnow introduced which compri ses forming said articles in a V I mold,draining off 'the water, adding ure water, sealing the mold, and applymgeat 5 cement which comprises to the exterior of the mold to cure thearti scaling the-mold, and applyng heet to the cle solely by the vaporgenerated in the ineXte-ior of the mold to cure the article solely terorofthe mold. 4 by vapor generated inctheginte-ior of the 10 3. Theprocess of curin hollow articles of mold, I

orming =the article In testimony whereof; Ihave hereunto set in a mold,drann ofl' the water'from the my hand'and aflixed my seal.

nterior of the artcle, adding pure water, I; FRANK AgSEIFER'I. [L. 8 .1

